I've been using Mac OS X's VNC service to connect remotely from a Windows XP box, via TightVNC. Everything seems to work normally, except that frequently - anywhere from ten seconds to ten minutes - the connection locks up entirely, without any sort of error message. The only solution is to reconnect and wait for it to lock up again.

1 Answer
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The problem turned out to be TightVNC's clipboard sharing. Whether this is a TightVNC or an OSX VNC server issue, I couldn't say. Disabling clipboard sharing in the TightVNC configuration made the problem go away entirely.